原油不同因素对20钢输油管道内壁腐蚀的影响  

Effect of Different Factors on Corrosion Behavior of 20 Steel in Crude Oil

作　　者：王莹 付文耀 淡勇[1] 李亚洲 李辉 毛振兴 李稳宏[1] WANG Ying;FU Wen-yao;DAN Yong;LI Ya-zhou;LI Hui;MAO Zhen-xing;LI Wen-hong(School of Chemical Engineering, Northwest University, Xi＇an 710069, China;The Twelfth Oil Production Plant, Changqing Oilfield, Qingyang 745400, China;School of Petrochemical Industry in Shaanxi Province. Xi＇ an 710061, China)

机构地区：[1]西北大学化工学院,陕西西安710069 [2]长庆油田第十二采油厂,甘肃庆阳745400 [3]陕西省石油化工学校,陕西西安710061

出　　处：《材料保护》2018年第3期121-123,126,共4页Materials Protection

基　　金：国家自然科学基金(21576224)资助

摘　　要：为了弄清实际工况中油、水和气三相混合时温度、流速和压力对20钢输油管道腐蚀的影响,自制了模拟生产现场的试验装置。利用正交试验和失重法探讨了庆阳合水地区输油管道20钢在不同温度、流速和压力原油下的腐蚀行为;利用扫描电镜(SEM)和X射线衍射技术对腐蚀产物进行了分析。结果表明:在80℃,3.0m/s,0.3 MPa下20钢的腐蚀速率最大,原油流速是20钢腐蚀的主要因素;20钢腐蚀产物呈片状和颗粒状,与基体结合松散、易脱落,对基体的保护作用较弱,其表面存在点蚀;不同流速下20钢的腐蚀产物组成基本相同,主要是Fe_3C和Fe_3O_4。The corrosion behaviors of 20 steel under different temperature, flow rate and pressure were studied by the methods of orthogonal ex- periment and weight loss test in the homemade experimental device of simulation of the production site. In addition, the corrosion products were analyzed by scanning electron microscopy and X-ray diffractometer. Results showed that the largest corrosion rate of 20 steel occurred under the conditions of 80℃ , 3.0 m/s and 0.3 MPa, and the major factor that caused the corrosion of 20 steel was crude oil flow rate. Furthermore, the corrosion products of 20 steel with loose structure that dropped off easily from the substrate were flake-like and particle-like and bad protective effect on the substrate, which resulted in pitting corrosion on the surface. The corrosion products of 20 steel at different flow had the same com- position that mainly contained Fe3C and Fe3O4.

关 键 词：原油温度 原油流速 原油压力 20钢 腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]